Construction of reinforcing-steel for reinforced concrete beams and girders.



No. 857.973. PATENTED JUNE 25, 1907.

' G. AUS. CONSTRUCTION OF RBIN-PORGING STEEL FOR REINFORCED CONCRETE BEAMS 7 AND GIRDBRS.

APPLIOATION FILED NOV. 27. 1906,.

Fzg. Fig.9 72910 WITNESSES: I llVl/Elvmfiat .by the reinforcing N T D STATES: PATENT OFFICE.

GUNVALD AUS, or BROOKLYN, NEW ,YORK'. CONSTRUCTION OF. REINFORCING-STEl-IL FOR REINFORCED'CONCREl'E BEAMS AND GIRDERS.

' Specification of Letters Patent.

1 Patented June 25, 1907.

Applieation'filed November 27,1906. Serial No. 845,339.

To. all whom, it may concern: I I Be it known that I, GUNvALn AUs, a citizen of the United States, residing at N o, 186" Brooklyn avenue, Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in the Construotion of Reinforcing-Steel for Reinforced Concrete Beams and Girders.

The invention relates to the connection of the main tension bars and .the stirru s or di-' agonals; and 1ts object is to connect t em ina cheap and efficient manner and more especially to provide a system whereby such connections can be made at a shop where the sizes can bereadi'ly ins ected, so that the assembledpieces can be s 'pped to the building as a unit ready to be deposited in place.

The invention also provides means where-' steel is kept at theroper distance above the bottom'of the mol to in-' sure the desired amount of concrete covering.

Figure 1 shows the completed reinforcing steel ready to be set in place. Fig. 2 is a side elevation showing'a reinforced center. Fig. 3 is a detail view showing two-die members utilized forindenting' the corners of a tension bar. Fig. 4 shows a stirrup or diagonal inisometric projection, and Fig. 5 shows the same stirrup or diagonal in place on the main tension bars. 'Fig. 6 shows the proposed -method of forcing the stirrups or diagonals in .place on the ma1n tension bars; Fig. '7 shows a section through the tension bars with a stirrup or diagonal in lace. Y Fig, 8 is a side View ofa tension bar s owingthe depressionor dents along'the edges. Fig- 9 'is a cross-section through a dent or depression;

vFig. 10showsa spacer in place on the main tension bars. Y

Ordinary square bars are passed between thejaws A of a hydraulic press or similar' machine and-the dents or depression D. formed along the edges as shown in Figs. 7, 8 and 9. Lighter square bars are bent by any suitable method into stirrups of the shape shown by Fig.4. The opening/0 being made to suit the difl'erent size bars to be used,

and only large enough to slip the stirrups on to the bars with a space between the bars of 1" .to 1%- or sufficient to allow the con-;, crete to pass through. Between the stirrups at suitable intervals will be placed the spacers E shown in Fig. 10. These spacers will be made of light fiat iron, say t X i and bent as shown. Their object is to keep the the bottom of the finished concrete beams. The required number of'stirrups and spacers are slipped ona pa'ir of tension bars and placed at the dents or depression. The bars 1n pairs and stirrups so assembled are passed under a hydraulic press as shown in Fig. 6 where the stirrups are pressed into the shape shown in dotted outllne in Fig. 6, and as shown in the isometric projection in Fig. 5, firmly gripping the main tension bars by being forced into the dents or depressions along the edges of the bars. The main ten sion bars and the stirrupsor diagonals are thus firmly united and the stirrups bear against the shoulders of the dents or depres- 'sion in the tension bars so that the concrete of the'bea'mgets a positive grip on the tension bars and does not depend only onadhesion to transmit the stresses into the bars.

The stirrups may either remain as shown remain. .But as the adhesion of cement to steel is generally sufficient to take care of the horizontal shearing stresses, this method may be used to advantage for long spans and light 10ers.

without being forced into the tension bars. While this would not be'as effective, it would still be an im rovement on the stirrups, as used to-day, t 's being generally aE-Zlshaped rod 'assed under the tension bars.

- hat I clajl'nas my invention is:

,1 A reinforcing means for concrete beams,

comprising a lurality of tension bars, and

stirrups 'coi ie about the same and indenin full lines in Figs. 1 and 2 in a perpendicu desired, they may be bent main tension'barsthe proper'distance above bling the main tension bars and the stirrups The ,stirrups may also be used in the form in which they are shown in- Fig. 4

tured between the bars to clamp and space and having parallel arms projecting therethelatter the proper distance apart, thus from with angular ends,

forming a unit, as set forth.

2. A reinforcing 'means for composition 5 material, consisting of tension bars having indentures formed in the circumference thereof, stirrups each formed into an angular coil, the strands thereof seated in-said indentures ortions of the coils 1c of the stirrups being in entured to 1101d the tension bars spaced apart, as set forth.

- GUNVALD AUS. Witnesses:

T. H. ANDERSON, AUG. LORANGE. 

